Okay, you're basing "weak spark" on assumptions. Spark is not where the power comes from. The BANG the spark creates is where the power comes from. If there's too much, or not enough, fuel in the fuel-air mixture, the bang will be weak, and the engine will not produce power.
If you want to verify the spark quality, remove a plug, put it back in the boot, and lay it against the engine block. Have someone hit the starter button while you watch the plug. Make sure the tractor is in neutral because it could start on 3 cylinders. You could disconnect the remaining 3 plug wires from their plugs to prevent that, just remember where they came from. I'll bet the spark is bright blue, which is perfect.
Unfortunately, your local advice, the one that's telling you to "go up a heat range" is just guessing. Whether that's because he's just taking your word on what's wrong, or he's trying to get rid of you, or he's trying to sell you more parts, or he's just clueless, is irrelevant. The heat range of the plugs is neither the cause nor the cure for this problem.
I believe you have a fuel delivery problem. The tractor won't start unless you "starve it for fuel" and will "flood" when you give it any choke at all. A carburetor service (I despise the word "rebuild" because all you're replacing is a few gaskets) including disassembly, cleanout, reset the float, etc. is in order.
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Today's Featured Article - The Cletrac General GG and the BF Avery A - A Bit of History - by Mike Ballash. This article is a summary of what I have gathered up from various sources on the Gletrac General GG and the B. F. Avery model A tractors. I am quite sure that most of it is accurate. The General GG was made by the Cleveland Tractor Company (Cletrac) of Cleveland, Ohio. Originally the company was called the Cleveland Motor Plow Company which began in 1912, then the Cleveland Tractor Company (1917) and finally Cletrac.
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